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Top: Peaks for undegraded samples of hydromorphone at 3.89 min, ketamine at 5.84 min, and the internal standard (naloxone) at 7.58 min. Bottom: Degraded preparation shows disappearance of the hydromorphone peak, a 40% reduction in the ketamine peak, and no interfering peaks. HyMO = hydromorphone, Ket = ketamine, Nal = naloxone, AU = absorbance units.
